19741 Callahan

Main-belt asteroid October 2019 yes 19741 Callahan #D6D6D6 5 January 2000 LINEAR Lincoln Lab ETS (19741) Callahan 2000 AN 1411978 RQ 8 Diane Callahan(mentor at DCYSC) main-belt(inner)background 4 September 2017 (JD 2458000.5) 0 38.66 yr (14,121 days) 2.5407 AU 1.9559 AU 2.2483 AU 0.1301 3.37 yr (1,231 days) 163.76° 0.2924 ms / day 8.0506° 167.39° 227.28° 3.12 km (calculated)3.876 0.166 km 7.2684 0.0015 h 0.20 (assumed)0.224 0.044 S 14.314.414.444 0.00414.89 19741 Callahan (provisional designation 2000 AN 141) is a stony background asteroid from the inner regions of the asteroid belt, approximately 3.5 kilometers in diameter. It was discovered on 5 January 2000, by the Lincoln Near-Earth Asteroid Research, LINEAR, at the Lincoln Laboratory's Experimental Test Site, Socorro, New Mexico, and named after a mentor of the 2003 Discovery Channel Young Scientist Challenge. Orbit and classification The S-type asteroid orbits the Sun in the inner main-belt at a distance of 2.0–2.5 AU once every 3 years and 4 months (1,231 days). Its orbit has an eccentricity of 0.13 and an inclination of 8° with respect to the ecliptic. Callahan was first identified as 1978 RQ8 at ESO's La Silla Observatory in 1978, which extends the asteroid's observation arc by 22 years prior to its official discovery observation. Physical characteristics In December 2009, a rotational lightcurve for this asteroid was obtained from photometric observations at the U.S. Palomar Transient Factory, California. It gave a rotation period of 7.2684 0.0015 hours with a relatively high brightness variation of 0.81 in magnitude (U=2), indicative of a non-spherical shape. According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Callahan measures 3.9 kilometers in diameter and its surface has an albedo of 0.22. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 3.1 kilometers, with an absolute magnitude of 14.89. Naming This minor planet was named after Diane Callahan, teacher at U.S. Fairfield Middle School, Ohio, who mentored a finalist in the 2003 Discovery Channel Youth Science Challenge (DCYSC), a middle school science competition. The approved naming citation was published by the Minor Planet Center on 10 October 2003 (M.P.C. 49772). References 2017-05-01 last obs. JPL Small-Body Database Browser: 19741 Callahan (2000 AN141) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2019741 Jet Propulsion Laboratory 5 July 2017 Dictionary of Minor Planet Names – (19741) Callahan, Addendum to Fifth Edition: 2003–2005 Schmadel Lutz D. Springer Berlin Heidelberg 142 2006 978-3-540-34360-8 10.1007/978-3-540-34361-5_1597 (19741) Callahan [2.25, 0.13, 8.0] 19741 Callahan (2000 AN141) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=19741 22 March 2016 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 17 May 2016 19741 17 May 2016 6 A. Mainzer T. Grav J. Masiero E. Hand J. Bauer D. Tholen R. S. McMillan T. Spahr R. M. Cutri E. Wright J. Watkins W. Mo C. Maleszewski November 2011 NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...90M The Astrophysical Journal 741 2 25 2011ApJ...741...90M 10.1088/0004-637X/741/2/90 1109.6407 17 May 2016 6 Adam Waszczak Chan-Kao Chang Eran O. Ofek Russ Laher Frank Masci David Levitan Jason Surace Yu-Chi Cheng Wing-Huen Ip Daisuke Kinoshita George Helou Thomas A. Prince Shrinivas Kulkarni September 2015 Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015AJ....150...75W The Astronomical Journal 150 3 35 2015AJ....150...75W 10.1088/0004-6256/150/3/75 1504.04041 17 May 2016 6 Joseph R. Masiero A. K. Mainzer T. Grav J. M. Bauer R. M. Cutri J. Dailey P. R. M. Eisenhardt R. S. McMillan T. B. Spahr M. F. Skrutskie D. Tholen R. G. Walker E. L. Wright E. DeBaun D. Elsbury T. IV Gautier S. Gomillion A. Wilkins November 2011 Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M The Astrophysical Journal 741 2 20 2011ApJ...741...68M 10.1088/0004-637X/741/2/68 1109.4096 3 December 2016 External links Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html 16 December 2017 ) Dictionary of Minor Planet Names, Google books Asteroids and comets rotation curves, CdR https://web.archive.org/web/20160729213840/http://obswww.unige.ch/~behrend/page_cou.html 29 July 2016 – Observatoire de Genève, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (15001)-(20000) – Minor Planet Center 19741 19741 019741 019741 Category:Named minor planets 20000105